How do you kill all Linux processes that are older than a certain age?

I have a problem with some zombie-like processes on a certain server that need to be killed every now and then. How can I best identify the ones that have run for longer than an hour or so?

Answer

If they just need to be killed:

if [[ "$(uname)" = "Linux" ]];then killall --older-than 1h someprocessname;fi

If you want to see what it’s matching

if [[ "$(uname)" = "Linux" ]];then killall -i --older-than 1h someprocessname;fi

The -i flag will prompt you with yes/no for each process match.